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Source mechanics for monochromatic icequakes produced during iceberg calving at Columbia Glacier, AK

January 1, 2007

Seismograms recorded during iceberg calving contain information pertaining to source processes during calving events. However, locally variable material properties may cause signal distortions, known as site and path effects, which must be eliminated prior to commenting on source mechanics. We applied the technique of horizontal/vertical spectral ratios to passive seismic data collected at Columbia Glacier, AK, and found no dominant site or path effects. Rather, monochromatic waveforms generated by calving appear to result from source processes. We hypothesize that a fluid-filled crack source model offers a potential mechanism for observed seismograms produced by calving, and fracture-processes preceding calving.

Citation Information

Publication Year 2007
Title Source mechanics for monochromatic icequakes produced during iceberg calving at Columbia Glacier, AK
DOI 10.1029/2007GL031370
Authors Shad O'Neel, W.T. Pfeffer
Publication Type Article
Publication Subtype Journal Article
Series Title Geophysical Research Letters
Series Number
Index ID 70174788
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center

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